CN110134258B - Active Stylus and Mobile Device System - Google Patents

Abstract

The invention relates to an active touch pen and a mobile device system. The active touch pen includes a pen tip, a pen body, a button, a first antenna, a second antenna, a first transmitter and a second transmitter. The first antenna is arranged at the pen point part, and the second antenna is arranged at the pen body. The output end of the first transmitting circuit is coupled to the first antenna for outputting the first modulated touch signal. The output end of the second transmitting circuit is coupled to the second antenna for outputting a second modulated touch signal. The first modulated touch signal and the second modulated touch signal are sent to a receiving part, the receiving part decodes the first modulated touch signal and the second modulated touch signal respectively to judge the carried value, and the receiving part can detect a first position and a second position according to the first modulated touch signal and the second modulated touch signal to judge the position of the pen point part.

Description

Active Stylus and Mobile Device System

technical field

The present invention relates to a capacitive sensing technology, and more specifically, the present invention relates to an active stylus and a mobile device system.

Background technique

The most widely used touch screen is the capacitive touch screen. Generally speaking, the capacitive touch screen is mainly used to detect the touch of a finger. Since the finger touch area on the touch screen is relatively large, the resolution of the touch is relatively low. However, in some applications, such as handwriting, a more precise position is required, so some mobile devices are equipped with an active stylus. The active stylus generally uses electromagnetic induction, that is, emits electromagnetic signals through the pen tip, and senses the position of the electromagnetic signal of the pen tip through the X-axis and Y-axis induction wires buried inside the touch panel of the mobile device, and further finds the position of the pen tip. exact coordinates.

Another way is to use an active stylus. FIG. 1 is a schematic circuit diagram of an active stylus 10 in the prior art. Please refer to FIG. 1 , the active stylus 10 includes a pen tip antenna 101 and a signal generator 102 . The sensing method is to set the antenna 101 on the tip of the capacitive stylus, and transmit signals through the signal generator 102 inside the active stylus, and use the original capacitive touch panel to perform capacitive sensing to obtain the coordinates .

However, when the active stylus 10 is tilted, since the antenna is also tilted, the coordinate 11 detected after tilting is different from the coordinate 12 of the actual pen tip. In order to solve this problem, the prior art proposes a solution, as shown in FIG. 2 . FIG. 2 is a schematic circuit diagram of the active stylus 20 . The active stylus 20 not only includes a pen tip antenna 201 and a signal generator 202 , but also includes a pen body signal shielding cover 203 . With the pen body signal shielding mask 203 , part of the pen tip antenna 201 and the wiring between the signal generator 202 and the pen tip antenna 201 are covered, so that the detected capacitance coordinates 23 can be closer to the ideal pen tip coordinates 22 . However, this method cannot obtain the tilt angle of the stylus and the coordinates of the actual touch, and the signal shielding mask 203 of the pen body will block most of the energy, making the output energy weaker. Therefore, there is a need for improvement in the prior art.

Contents of the invention

The purpose of the present invention is to provide an active stylus and a mobile device system, which corrects the position of the pen tip, and simultaneously transmits the pressure sensing value and the button pressing determination value.

In view of this, the present invention provides an active stylus, which includes a tip, a body, a first antenna, a second antenna, a first transmitting circuit and a second transmitting circuit. circuit. The above-mentioned pen body is connected with the nib part, and the above-mentioned button is arranged on the pen body. The first antenna is arranged at the tip of the pen. The second antenna is configured on the body of the pen. The first transmitting circuit includes an output terminal, wherein the output terminal of the first transmitting circuit is coupled to the first antenna for outputting a first modulated touch signal. The second transmitting circuit includes an output terminal, wherein the output terminal of the second transmitting circuit is coupled to the second antenna for outputting a second modulated touch signal, wherein the first modulated touch signal and the second modulated touch signal The touch signal is sent to a receiving part, and the receiving part respectively decodes the first modulated touch signal and the second modulated touch signal to judge a first data and a second data loaded therein, And the receiving part can detect a first position and a second position according to the first modulated touch signal and the second modulated touch signal, and thus determine the position of the pen tip.

The present invention further provides a mobile device system, the mobile device system includes a mobile device and an active stylus. The above-mentioned mobile device includes a touch panel, and the touch panel has a capacitive sensing mode and a receiving mode. The active touch pen includes a pen tip, a pen body, a first antenna, a second antenna, a first transmitting circuit and a second transmitting circuit. The above-mentioned pen body is connected with the nib part, and the above-mentioned button is arranged on the pen body. The first antenna is arranged at the tip of the pen. The second antenna is configured on the body of the pen. The first transmitting circuit includes an output terminal, wherein the output terminal of the first transmitting circuit is coupled to the first antenna for outputting a first modulated touch signal. The second transmitting circuit includes an output terminal, wherein the output terminal of the second transmitting circuit is coupled to the second antenna for outputting a second modulated touch signal, wherein, when the touch panel of the mobile device is in a receiving mode , the touch panel detects a first position according to the first modulated touch signal, at the same time, the touch panel detects a second position according to the second modulated touch signal, and judges the pen tip according to the first position and the second position Department location. In the receiving mode, the touch panel respectively demodulates the first modulated touch signal and the second modulated touch signal to decode a carried first data and a second data, wherein the action The device performs a one-to-one correspondence operation through the first data and the second data.

According to the active stylus and the mobile device system described in the preferred embodiment of the present invention, the first modulated touch signal output by the above-mentioned first transmitting circuit is used to transmit the pressure value of the pen tip, and the output of the second transmitting circuit The second modulated touch signal is used to transmit the button press determination value. In another preferred embodiment, the second modulated touch signal output by the above-mentioned second transmitting circuit is used to transmit the pen tip pressure value, and the first modulated touch signal outputted by the first transmitting circuit is used to transmit the button Push down the judgment value.

According to the active stylus and the mobile device system described in the preferred embodiment of the present invention, the signals of the second modulated touch signal and the first modulated touch signal are the same modulated signal, and the pen tip pressure is carried value and the button press judgment value. In addition, in a preferred embodiment, the above-mentioned nib pressure value and the above-mentioned button press determination value are respectively converted by Walsh and added to obtain the modulation signal.

In the embodiment of the present invention, two antennas at different positions are used to transmit signals at the same time. Since the distance between the two antennas is known, if the touch panel detects the position of the touch point corresponding to the two antennas, the distance between the two antennas is known. As well as the distance between the touch point positions corresponding to the two antennas, the inclination angle and the actual position of the pen tip are determined. In addition, these two transmitting signals can also be used to transmit, for example, the pen tip pressure value, button determination value, remaining power of the stylus, brand information or other information that can be interpreted by the user, so that the mobile device and the active stylus The application between can be more extended.

Description of drawings

FIG. 1 is a schematic circuit diagram of an active stylus 10 in the prior art.

FIG. 2 is a schematic circuit diagram of another prior art active stylus 20 .

FIG. 3 is a schematic diagram of a mobile device system according to a preferred embodiment of the present invention.

FIG. 4 is a schematic circuit diagram of an active stylus 40 according to a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of mode switching when the mobile device performs touch sensing.

FIG. 6 is a circuit diagram of a wireless charging receiver according to a preferred embodiment of the present invention.

FIG. 7 is a schematic diagram of signal transmission of an active stylus according to a preferred embodiment of the present invention.

Symbol Description

10, 20: Active stylus 101, 201: Pen tip antenna

102, 202: Signal generator 11: Coordinates detected after tilting

12: The coordinates of the actual pen tip 203: The signal shielding mask of the pen body

23: Capacitance coordinates 22: Ideal pen tip coordinates

301: Mobile Devices 302: Active Stylus

303: Capacitive touch panel 401: Pen tip

402: Pen body 403: Button

404: First Antenna 405: Second Antenna

406: the first transmitting circuit 407: the second transmitting circuit

STX1: the first modulated touch signal STX2: the second modulated touch signal

Ts: Touch detection time Tc: Capacitive sensing period

Tr: during receive mode

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation, structure, features and effects of the present invention will be described in detail below in conjunction with the accompanying drawings and examples.

FIG. 3 is a schematic diagram of a mobile device system according to a preferred embodiment of the present invention. Please refer to FIG. 3 , the mobile device system includes a mobile device 301 and an active stylus 302 . The mobile device 301 is, for example, an electronic device such as a smart phone, a tablet computer, or a notebook computer with a touch function. In this embodiment, a smart phone or a tablet computer is taken as an example. The mobile device 301 includes a capacitive touch panel 303. The capacitive touch panel 303 is, for example, an in-cell touch display panel or an add-on touch panel. The mobile device can also be called a receiving unit, which is used to receive the signal transmitted by the active stylus and process the received signal, such as decoding.

FIG. 4 is a schematic circuit diagram of an active stylus 302 according to a preferred embodiment of the present invention. Please refer to FIG. 4, the active stylus 302 includes a tip 401, a body 402, a button 403, a first antenna 404, a second antenna 405, a first transmitting circuit 406 and a second transmitting circuit. Circuit 407. The pen body 402 is connected to the pen tip 401 , and the button is disposed on the pen body 402 . The first antenna 404 is disposed on the pen tip 401. The second antenna 405 is disposed on the pen body 402 . The output terminal of the first transmitting circuit 406 is coupled to the first antenna 404 for outputting the first modulated touch signal STX1. The output terminal of the second transmitting circuit 407 is coupled to the second antenna 405 for outputting the second modulated touch signal STX2.

FIG. 5 is a schematic diagram of mode switching when the mobile device performs touch sensing. Please refer to FIG. 5 , in an embodiment of the present invention, the touch detection time Ts of the touch panel is divided into two periods, the first period is the capacitive sensing period Tc, and the second period is the receiving mode period Tr. During the capacitive sensing period Tc, the capacitive touch panel 303 transmits a touch sensing signal and determines the coordinates of the conductor or finger according to the attenuation of the electric field of the touch sensing signal absorbed by the conductor or finger. During the period Tr of the receiving mode, the capacitive touch panel 303 can be converted into a signal receiving mode to wait for the signal transmitted by the external active stylus 302, and receive the signal according to the signal transmitted by the active stylus 302. position, to determine the coordinates of the pen tip 401 .

FIG. 6 is a schematic diagram of detection of an active stylus 302 according to a preferred embodiment of the present invention. Please refer to FIG. 6. In this embodiment, since the active stylus 302 of the preferred embodiment of the present invention has two sets of antennas 404 and 405, if the user tilts the active stylus 302, the capacitive touch During the receiving mode, the control panel 303 detects the coordinates (X1, Y1) of the first modulated touch signal STX1 and the coordinates (X2, Y2) of the second modulated touch signal STX2. In addition, the distance between the first antenna 404 and the second antenna 405 is known, so the position of the pen tip 401 can be determined by using trigonometric function calculation or heterodyne calculation. Similarly, during the period Tr of the receiving mode of the capacitive touch panel 303, the capacitive touch panel 303 demodulates the received first modulated touch signal STX1 and the second modulated touch signal STX2. The result of the modulation is used to decode the load data such as the pen tip pressure value and a button press determination value, wherein the pen tip pressure value is the user’s pressure on the pen tip when using the stylus pen, and the button press The judgment value is whether the user presses down the button when using the stylus. In an embodiment, the stylus may also not include a button, therefore, the demodulation result value does not include the button press determination value. In the above embodiments, for example, the pen tip pressure value and remaining battery power information or pen tip pressure value, brand information or other data that can be interpreted by the user may also be transmitted. Therefore, the present invention is not limited to the active stylus with buttons.

Generally speaking, the nib pressure value is used to detect the depth of force used by the user when drawing or writing, so it can be used to judge the color depth of painting/handwriting. Whether the button is pressed or not can be given two different applications according to the design of the mobile device system. For example, when a button is pressed, it will enter the screenshot mode and take a screenshot of the closed area that the user has swiped. If the button is not pressed, it will be judged as a general touch or drawing behavior.

According to the above hardware design, two signals with different frequencies can be used in the signal transmission and demodulation part. FIG. 7 is a schematic diagram of signal transmission of an active stylus according to a preferred embodiment of the present invention. Please refer to FIG. 7 , the first transmitting circuit 406 transmits the first modulated touch signal STX1 for multiplying the pen tip pressure value; the second transmitting circuit 407 transmits the second modulated touch signal STX2 for multiplying the button Push down the judgment value. In another embodiment, the first transmitting circuit 406 transmits the first modulated touch signal STX1 for multiplying the button press determination value; the second transmitting circuit 407 transmits the second modulated touch signal STX2 for Multiplied by the pen tip pressure value. Since the capacitive touch panel 303 is only used for receiving during the receiving mode, it can receive two different signals through different frequency band-pass filter functions. Through demodulation, the pen tip pressure value and button press determination value can be obtained respectively.

Another method is to make the first modulated touch signal STX1 and the second modulated touch signal STX2 transmitted by the first antenna 404 and the second antenna 405 be the same modulated signal, and the modulated signal carries Pen tip pressure value and button press judgment value. In order to briefly illustrate the modulation method, Code Division Multiplex Access (CDMA) and Walsh Transform are taken as examples below. For example, the first data to be transmitted is (1,0,1), the second data to be transmitted is (1,1,0), and an 8×8 Walsh matrix is used as the modulation of the data. Change and demodulation change basis. Among them, the 8×8 Walsh matrix is as follows:

Step 1: Convert the 0 part of the first data to be transmitted (1,0,1) to -1, and then modulate it with the first channel (the first column of the Walsh matrix) to obtain A first channel data [1×first channel, -1×first channel, 1×first channel], that is, [1,1,1,1,1,1,1,1,-1,-1 ,-1,-1,-1,-1,-1, -1,1,1,1,1,1,1,1,1]; In addition, the second data to be transmitted (1, 1,0) is first converted to -1, and then modulated with the second channel (the second column of the Walsh matrix) to obtain a second channel data [1×second channel, -1×the second channel Two channels, 1 × second channel], that is, [1,1,1,1,-1,-1,-1,-1,1, 1,1,1,-1,-1,-1, -1,-1,-1,-1,-1,1,1,1,1].

Step 2: Add the obtained first channel data and second channel data together, namely [1,1,1,1,1, 1,1,1,-1,-1,-1,-1, -1,-1,-1,-1,1,1,1,1,1,1,1,1]+[1,1,1,1,-1,-1,-1,-1, 1, 1,1,1,-1,-1,-1,-1,-1,-1,-1,-1,1,1,1,1]=[2,2,2,2, 0,0,0,0,0,0,0,0,-2,-2,-2,-2,0,0,0,0,2,2,2,2].

The third step: the above 24 digital data [2,2,2,2,0,0,0,0,0,0,0,0,-2,-2,-2,-2,0,0 ,0,0,2,2,2,2], transmitted to the capacitive touch panel 303 by pulse modulation or other modulation methods.

The capacitive touch panel 303 receives the above 24 digital data [2,2,2,2,0,0,0,0,0,0,0,0,-2,-2,-2,-2 ,0,0,0,0,2,2,2,2], demodulate in the following way:

The first step: the above digital data [2,2,2,2,0,0,0,0,0,0,0,0,-2,-2,-2,-2,0,0,0 , 0,2,2,2,2], take every 8 pieces of data as one piece of data, divide it into three pieces of data, and get [2,2,2,2,0,0, 0,0]; [0,0 ,0,0,-2,-2,-2,-2]; [0,0,0,0,2,2,2,2].

The second step: the above three data [2,2,2,2,0,0,0,0]; [0,0,0,0,-2,-2,-2,-2]; [ 0, 0,0,0,2,2,2,2] and the first channel (the first column of the Walsh matrix) [1,1,1,1,1,1,1,1] respectively Product operation, [8,-8,8] is obtained, so the data of the first channel can be obtained as [1,0,1].

The third step: the above three data [2,2,2,2,0,0,0,0]; [0,0,0,0,-2,-2,-2,-2];[ 0, 0,0,0,2,2,2,2] and the second channel (the second column of the Walsh matrix) [1,1,1,1,-1,-1,-1,- 1] Perform the inner product operation to obtain [8,8,-8], so the data of the first channel can be obtained as [1,1,0].

In this way, even though the first modulated touch signal STX1 and the second modulated touch signal STX2 are the same modulated signal, two different data can still be decoded. It is worth mentioning that, in the above embodiments, the demodulation method can be performed in a manner that the first modulated touch signal and the second adjusted touch signal are orthogonal.

To sum up, the embodiment of the present invention utilizes two antennas at different positions to transmit signals at the same time. Since the distance between the two antennas is known, if the touch panel detects the two touch point position signals transmitted by the two antennas respectively, , by using the known distance between the two antennas and the distance between the two touch points, the inclination angle and the actual position of the pen tip can be judged. In addition, the two transmitting signals can also be used to transmit the pressure value of the pen tip and the determination value of the button, so that the application between the mobile device and the active stylus can be further expanded. Furthermore, the present invention can transmit the signal of the touch point and the pressure value of the pen tip at the same time, thus speeding up the response speed of the touch and pressure detection of the mobile device.

As used herein, the terms "comprises", "comprises" or any other variation thereof are intended to cover a non-exclusive inclusion of elements other than those listed and also other elements not expressly listed.

In this article, the orientation words such as front, rear, upper, and lower involved are defined by the parts in the drawings and the positions between the parts in the drawings, just for the clarity and convenience of expressing the technical solution. It should be understood that the use of the location words should not limit the scope of protection claimed in this application.

In the case of no conflict, the above-mentioned embodiments and features in the embodiments herein may be combined with each other.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (12)

1. An active stylus, comprising:

a pen tip portion;

a pen body connected with the pen point part;

a first antenna configured on the pen point part;

a second antenna configured on the pen body;

a first transmitter circuit including an output terminal, wherein the output terminal of the first transmitter circuit is coupled to the first antenna for outputting a first modulated touch signal; and

a second transmitting circuit including an output terminal, wherein the output terminal of the second transmitting circuit is coupled to the second antenna for outputting a second modulated touch signal,

the touch control device is characterized in that the first modulation touch control signal and the second modulation touch control signal are sent to a receiving part, the receiving part respectively decodes the first modulation touch control signal and the second modulation touch control signal to judge and read a first data and a second data carried by the receiving part, the receiving part can detect a first position and a second position according to the first modulation touch control signal and the second modulation touch control signal and judge the position of the pen point part according to the first modulation touch control signal and the second modulation touch control signal, the receiving part can simultaneously detect the first position and the second position and simultaneously receive the first data and the second data,

wherein the first data and the second data respectively comprise K bits of data, and the first modulated touch signal and the second modulated touch signal are the same modulated signal modulated by Walsh transformation matrix of the first data, the second data and N x N, wherein each bit of the first data and the second data is expanded into N identical data, and bit 0 of the first data and the second data is changed to-1, wherein the length of the expanded first data and the second data is N x K, then the expanded first data and the second data are respectively multiplied by a first row and a second row of the Walsh transformation matrix of N x N, and then the expanded first data and the expanded second data are added to obtain the modulated signal, wherein the length of the modulated signal is N x K,

the receiving part receives the modulation signal and multiplies the modulation signal by a first row and a second row of a Walsh transform matrix of N x N respectively to obtain the first data and the second data respectively, wherein K and N are natural numbers larger than 0.

2. The active stylus of claim 1, further comprising a button disposed on the body.

3. The active stylus of claim 1, wherein the first data and the second data respectively comprise a tip pressure value and a button down decision value.

4. The active stylus of claim 3, wherein the first modulated touch signal output by the first transmitter circuit is configured to transmit the tip pressure value, and the second modulated touch signal output by the second transmitter circuit is configured to transmit the button down determination value.

5. The active stylus of claim 3, wherein the second modulated touch signal output by the second transmitter circuit is configured to transmit the tip pressure value, and the first modulated touch signal output by the first transmitter circuit is configured to transmit the button down determination value.

6. The active stylus of claim 1, wherein the receiving portion comprises an electronic device having a touch panel.

7. A mobile device system, comprising:

a mobile device comprising:

a touch panel, wherein the touch panel has a capacitive sensing mode and a receiving mode;

an active stylus, comprising:

a pen tip portion;

a pen body connected with the pen point part;

a first antenna configured on the pen point part;

a second antenna configured on the pen body;

a first transmitting circuit including an output terminal, wherein the output terminal of the first transmitting circuit is coupled to the first antenna for outputting a first modulated touch signal; and

a second transmitting circuit including an output terminal, wherein the output terminal of the second transmitting circuit is coupled to the second antenna for outputting a second modulated touch signal,

when the touch panel of the mobile device is in a receiving mode, the touch panel detects a first position according to the first modulation touch signal, and simultaneously, the touch panel detects a second position according to the second modulation touch signal, and the position of the pen point part is judged according to the first position and the second position;

wherein, in the receiving mode, the touch panel respectively demodulates the first modulated touch signal and the second modulated touch signal to decode a first data and a second data carried by the touch panel,

wherein the mobile device performs a corresponding operation by the first data and the second data, and the mobile device can simultaneously detect the first position and the second position and simultaneously receive the first data and the second data when in the receiving mode,

wherein the first data and the second data respectively comprise K bits of data, and the first modulated touch signal and the second modulated touch signal are the same modulated signal modulated by Walsh transformation matrix of the first data, the second data and N x N, wherein each bit of the first data and the second data is expanded into N identical data, and bit 0 of the first data and the second data is changed to-1, wherein the length of the expanded first data and the second data is N x K, then the expanded first data and the second data are respectively multiplied by a first row and a second row of the Walsh transformation matrix of N x N, and then the expanded first data and the expanded second data are added to obtain the modulated signal, wherein the length of the modulated signal is N x K,

the receiving part receives the modulation signal and multiplies the modulation signal by a first row and a second row of a Walsh transform matrix of N x N respectively to obtain the first data and the second data respectively, wherein K and N are natural numbers larger than 0.

8. The system of claim 7, further comprising a button disposed on the pen body.

9. The mobile device system of claim 8, wherein the first data and the second data respectively comprise a tip pressure value and a button down decision value.

10. The mobile device system of claim 9, wherein the first modulated touch signal output by the first transmitter circuit is used to transmit the tip pressure value, and the second modulated touch signal output by the second transmitter circuit is used to transmit the button down pressure determination value.

11. The mobile device system of claim 9, wherein the second modulated touch signal output by the second transmitter circuit is used to transmit the tip pressure value, and the first modulated touch signal output by the first transmitter circuit is used to transmit the button down pressure determination value.

12. The mobile device system of claim 7, wherein the first modulated touch signal and the second modulated touch signal are demodulated in an orthogonal manner.

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